Turn Around, Brothers Four. 

Malvina Reynolds (August 23, 1900 - March 17, 1978) was an American folk/blues singer-songwriter and political activist, best known for her songwriting, particularly the songs "Little Boxes", Turn Around and "What Have They Done to the Rain."
The Brothers Four is an American folk singing group, founded in 1957 in Seattle, Washington, and known for their 1960 hit song "Greenfields".
Lyrics
Where are you going, my little one, little one
Where are you going, my baby, my own?
Turn around and you're two
Turn around and you're four
Turn around and you're a young girl going out of my door
Turn around, turn around
Turn around and you're a young girl going out of my door
Where are you going, my little one, little one
Little dirndls and petticoats, where have you gone
Turn around and you're tiny
Turn around and you're grown
Turn around and you're a young wife with babes of your own
Turn around, turn around
Turn around and you're a young wife with babes of your own